Sleep Calculator: Your Personalized Tool for Sleep | Sleep Foundation
Sleep Calculator App on the App Store
Sleep Cycle Calculator | Devpost
This 'sleep calculator' will tell you exactly when to go to bed for the perfect night's sleep | For The Win
Sleep calculator: How much sleep do I need? | Sleep calculator, Sleeping too much, Sleep medicine
SleepTiming: Sleep Calculator to Help You Wake Up
WellAdvantage - If you're aiming for 7 to 9 hours of sleep each night, a sleep calculator can help you figure out what time to go to bed based on your wake-up
How Much Sleep You Need, According to a Sleep Calculator | Well+Good